grade 9 polynomials

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7 (r+3s) - 2(2r -9s)
I am having a hard time solving can anyone please help

  • grade 9 polynomials -

    Multiply the # outside the parenthesis by each item inside the parenthesis to remove the parentesis and then combine the like terms (r's & s's).

  • grade 9 polynomials -

    7r + 21s - 4r + 18S
    then combine like terms

  • grade 9 polynomials -

    7r +21s - 4r +18s
    7r-4r =21s+18s

    3r+39

    Does this sound correct.

  • grade 9 polynomials -

    Yes , but 39s

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